<?php
namespace lib;

class hieroglyphy
{
	private $characters;
	private $numbers;
	private $unescape;
	private $functionConstructor;

	public function __construct() {
		$this->precharacters();
	}

	private function precharacters() {
		$this->numbers = array(
			"+[]",
			"+!![]",
			"!+[]+!![]",
			"!+[]+!![]+!![]",
			"!+[]+!![]+!![]+!![]",
			"!+[]+!![]+!![]+!![]+!![]",
			"!+[]+!![]+!![]+!![]+!![]+!![]",
			"!+[]+!![]+!![]+!![]+!![]+!![]+!![]",
			"!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]",
			"!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]"
		);

		$this->characters = array(
			"0" => "(" . $this->numbers[0] . "+[])",
			"1" => "(" . $this->numbers[1] . "+[])",
			"2" => "(" . $this->numbers[2] . "+[])",
			"3" => "(" . $this->numbers[3] . "+[])",
			"4" => "(" . $this->numbers[4] . "+[])",
			"5" => "(" . $this->numbers[5] . "+[])",
			"6" => "(" . $this->numbers[6] . "+[])",
			"7" => "(" . $this->numbers[7] . "+[])",
			"8" => "(" . $this->numbers[8] . "+[])",
			"9" => "(" . $this->numbers[9] . "+[])"
		);

		$_object_Object = "[]+{}";
		$_NaN           = "+{}+[]";
		$_true          = "!![]+[]";
		$_false         = "![]+[]";
		$_undefined     = "[][[]]+[]";

		$this->characters[" "] = "(" . $_object_Object . ")[" . $this->numbers[7] . "]";
		$this->characters["["] = "(" . $_object_Object . ")[" . $this->numbers[0] . "]";
		$this->characters["]"] = "(" . $_object_Object . ")[" . $this->characters[1] . "+" . $this->characters[4] . "]";
		$this->characters["a"] = "(" . $_NaN . ")[" . $this->numbers[1] . "]";
		$this->characters["b"] = "(" . $_object_Object . ")[" . $this->numbers[2] . "]";
		$this->characters["c"] = "(" . $_object_Object . ")[" . $this->numbers[5] . "]";
		$this->characters["d"] = "(" . $_undefined . ")[" . $this->numbers[2] . "]";
		$this->characters["e"] = "(" . $_undefined . ")[" . $this->numbers[3] . "]";
		$this->characters["f"] = "(" . $_false . ")[" . $this->numbers[0] . "]";
		$this->characters["i"] = "(" . $_undefined . ")[" . $this->numbers[5] . "]";
		$this->characters["j"] = "(" . $_object_Object . ")[" . $this->numbers[3] . "]";
		$this->characters["l"] = "(" . $_false . ")[" . $this->numbers[2] . "]";
		$this->characters["n"] = "(" . $_undefined . ")[" . $this->numbers[1] . "]";
		$this->characters["o"] = "(" . $_object_Object . ")[" . $this->numbers[1] . "]";
		$this->characters["r"] = "(" . $_true . ")[" . $this->numbers[1] . "]";
		$this->characters["s"] = "(" . $_false . ")[" . $this->numbers[3] . "]";
		$this->characters["t"] = "(" . $_true . ")[" . $this->numbers[0] . "]";
		$this->characters["u"] = "(" . $_undefined . ")[" . $this->numbers[0] . "]";
		$this->characters["N"] = "(" . $_NaN . ")[" . $this->numbers[0] . "]";
		$this->characters["O"] = "(" . $_object_Object . ")[" . $this->numbers[8] . "]";

		$_Infinity = "+(" . $this->numbers[1] . "+" . $this->characters["e"] . "+" . $this->characters[1] . "+" . $this->characters[0] . "+" . $this->characters[0] . "+" . $this->characters[0] . ")+[]";

		$this->characters["y"] = "(" . $_Infinity . ")[" . $this->numbers[7] . "]";
		$this->characters["I"] = "(" . $_Infinity . ")[" . $this->numbers[0] . "]";

		$_1e100 = "+(" . $this->numbers[1] . "+" . $this->characters["e"] . "+" . $this->characters[1] . "+" . $this->characters[0] . "+" . $this->characters[0] . ")+[]";

		$this->characters["+"] = "(" . $_1e100 . ")[" . $this->numbers[2] . "]";

		$this->functionConstructor = "[][" . $this->hieroglyphyString("sort") . "][" . $this->hieroglyphyString("constructor") . "]";

		//Below  $this->characters need target http(s) pages
		$locationString        = "[]+" . $this->hieroglyphyScript("return location");
		$this->characters["h"] = "(" . $locationString . ")" . "[" . $this->numbers[0] . "]";
		$this->characters["p"] = "(" . $locationString . ")" . "[" . $this->numbers[3] . "]";
		$this->characters["/"] = "(" . $locationString . ")" . "[" . $this->numbers[6] . "]";

		$this->unescape = $this->hieroglyphyScript("return unescape");
		$escape         = $this->hieroglyphyScript("return escape");

		$this->characters["%"] = $escape . "(" . $this->hieroglyphyString("[") . ")[" . $this->numbers[0] . "]";
	}

	private function getHexaString($number, $digits) {
		$string = bin2hex($number);

		while (strlen($string) < $digits) {
			$string = "0" . $string;
		}

		return $string;
	}

	private function getUnescapeSequence($charCode) {
		return $this->unescape . "(" .
			$this->hieroglyphyString("%" . $this->getHexaString($charCode, 2)) . ")";
	}

	private function getHexaSequence($charCode) {
		return $this->hieroglyphyString("\\x" . $this->getHexaString($charCode, 2));
	}

	private function getUnicodeSequence($charCode) {
		return $this->hieroglyphyString("\\u" . $this->getHexaString($charCode, 4));
	}

	private function hieroglyphyCharacter($char) {
		$charCode = ord($char);

		if (isset($this->characters[$char])) {
			return $this->characters[$char];
		}

		if (($char == "\\") || ($char == "x")) {
			//These chars must be handled appart becuase the others need them
			$this->characters[$char] = $this->getUnescapeSequence($charCode);
			return $this->characters[$char];
		}

		$shortestSequence = $this->getUnicodeSequence($charCode);

		//ASCII  $characters can be obtained with hexa and unscape sequences
		if ($charCode < 128) {
			$unescapeSequence = $this->getUnescapeSequence($charCode);
			if (strlen($shortestSequence) > strlen($unescapeSequence)) {
				$shortestSequence = $unescapeSequence;
			}

			$hexaSequence = $this->getHexaSequence($charCode);
			if (strlen($shortestSequence) > strlen($hexaSequence)) {
				$shortestSequence = $hexaSequence;
			}
		}

		$this->characters[$char] = $shortestSequence;
		return $shortestSequence;
	}

	public function hieroglyphyString($str) {
		$hieroglyphiedStr = "";

		for ($i = 0; $i < strlen($str); $i++) {

			$hieroglyphiedStr .= ($i > 0) ? "+" : "";
			$hieroglyphiedStr .= $this->hieroglyphyCharacter($str[$i]);
		}

		return $hieroglyphiedStr;
	}

	public function hieroglyphyNumber($n) {
		$n = +$n;

		if ($n <= 9) {
			return $this->numbers[$n];
		}

		return "+(" . $this->hieroglyphyString(ord($n[10])) . ")";
	}

	public function hieroglyphyScript($src) {
		return $this->functionConstructor . "(" . $this->hieroglyphyString($src) . ")()";
	}
}